The supreme triumph of reason is to cast doubt upon its own validity.

If a person never contradicts himself, it must be that he says nothing.

Men shout to avoid listening to one another.

Fascism is cured by reading, and racism is cured by traveling

And killing time is perhaps the essence of comedy, just as the essence of tragedy is killing eternity.

A lot of good arguments are spoiled by some fool who knows what he is talking about.

Life is doubt, and faith without doubt is nothing but death.